Change volume controls to change the volume of the selected app.

As opposed to always changing the volume of the default sink.

1 files changed, 69 insertions, 0 deletions

diff --git a/extras/HOME/.local/bin/set-app-volume.sh b/extras/HOME/.local/bin/set-app-volume.sh
new file mode 100755
index 0000000..ae19ae2
--- /dev/null
+++ b/extras/HOME/.local/bin/set-app-volume.sh
@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+# Best-effort script to control volume of the focused application,
+# falling back to the default sink.
+
+USAGE="Usage: $(basename "$0") --up | --down"
+
+# Get the focused window ID
+FOCUSED_WIN_ID=$(xprop -root _NET_ACTIVE_WINDOW | awk '{print $NF}')
+
+SINK_INPUT_INDEX=""
+if [ -n "$FOCUSED_WIN_ID" ] && [ "$FOCUSED_WIN_ID" != "0x0" ]; then
+    # Get the PID of the focused window
+    PID=$(xprop -id "$FOCUSED_WIN_ID" _NET_WM_PID | awk '{print $NF}')
+
+    if [ -n "$PID" ]; then
+        # Find PulseAudio sink input index for this PID
+        SINK_INPUT_INDEX=$(pactl list sink-inputs | awk -v pid=""$PID"" '
+            BEGIN { RS=""; FS="
+"; index=-1 }
+            /application.process.id = / {
+                in_block=0
+                for (i=1; i<=NF; i++) {
+                    if ($i ~ /Sink Input #/) {
+                        current_index = substr($i, 14)
+                    }
+                    if ($i ~ "application.process.id = " pid) {
+                        index = current_index
+                        exit
+                    }
+                }
+            }
+            END { if (index != -1) print index }
+        ')
+    fi
+fi
+
+ACTION=$1
+CHANGE="5%"
+
+set_volume() {
+    local target=$1
+    local diff=$2
+    if [[ "$target" == *#* ]]; then
+        echo "Setting volume for Sink Input $target ($diff)" >&2
+        pactl set-sink-input-volume "${target#SINK INPUT #}" "$diff"
+    else
+        echo "Setting default sink volume ($diff)" >&2
+        pactl set-sink-volume "$target" "$diff"
+    fi
+}
+
+TARGET="@DEFAULT_SINK@"
+if [ -n "$SINK_INPUT_INDEX" ]; then
+    TARGET="SINK INPUT #$SINK_INPUT_INDEX"
+fi
+
+case $ACTION in
+    --up)
+        set_volume "$TARGET" "+$CHANGE"
+        ;;
+    --down)
+        set_volume "$TARGET" "-$CHANGE"
+        ;;
+    *)
+        echo "$USAGE" >&2
+        exit 1
+        ;;
+esac